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Photo by: Sang Tan
** FILE ** Kweku Adoboli arrives for a hearing in City of London Magistrates' Court in London on Thursday, Sept. 22, 2011. He is accused of fraud and two charges of false accounting over three years at Swiss banking giant UBS. (AP Photo/Sang Tan, File)

Robert Mueller’s special counsel investigation into Russian meddling in the 2016 election has cost $6.7 million during the first four and a half months of the probe. Click to see past independent counsel investigations guilty of racking up high bills.